1080 Wisconsin Academy of Sciences, Arts, and Letters . 
as found for the preparations examined in the laboratory is given 
in the tables which follow. 
Table 70 —Laboratory preparations—loss in weight on heating. 
Sample 
No. 
Date. 
Observer. 
Solvent. 
Per ct. of loss 
on heating-. 
1. 
1.916 
DuMez. 
Alcohol. 
At 110 ° C 
12.82 
11.92 
7.84 
11.54 
11.08 
11.50 
2. 
Acetone... 
5. 
6. 
“ 
3. 
Ether. 
4. 
Petrol, ether. 
Table 80. — Commercial samples—loss in weight on heating. 
Sample 
No. 
Date 
Observer 
Source 
Per cent of 
loss on 
heating 
1. . 
1916 
DuMez . 
Lilly & Co... 
At 110° C 
18.90 
21.39 1 
22.97 
2. 
Squibb & Sons...... 
3. 
. * . 
Sharp & Dohme. 
1 The presence of ether could he detected by the odor. 
Ash content: The ash content of the oleoresin prepared with 
acetone was found to be 0.28 per cent., whereas, that of the 
preparation made with ether was only 0.14 per cent. The values 
obtained for the commercial samples examined also showed this 
variation due to the nature of the solvent. Copper, although 
detected in two of these preparations (commercial oleoresins), 
was present in such small quantities that the results were not 
affected materially thereby. The following tables show the 
results obtained in the ash determinations made in the laboratory. 
Table 81. — Ash contents of oleoresins prepared in the laboratory. 
Sample 
No. 
Date 
Observer 
Solvent 
Per cent of 
ash 
1 ... 
1916 
DuMez . 
Alcohol.. 
0.42 
2. 
Acetone. 
0.80 
3.. 
44 
0.26 
4......... 
4ft 
“ 
0.28 
5.... 
44 
Ether..... 
0.14 
6......... 
44 
Petrol, ether. 
0.06 
